Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2007 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Sebastian Davids <sdavids@gmx.de> - Fix for bug 93353 - * [Dialogs] InternalErrorDialog#buttonPressed should explicitly call super *******************************************************************************/ package org.eclipse.ui.internal.ide.dialogs; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.PrintStream; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; /** * Added a Details button to the MessageDialog to show the exception * stack trace. */ public class InternalErrorDialog extends MessageDialog { private Throwable detail; private int detailButtonID = -1; private Text text; //Workaround. SWT does not seem to set the default button if //there is not control with focus. Bug: 14668 private int defaultButtonIndex = 0; /** * Size of the text in lines. */ private static final int TEXT_LINE_COUNT = 15; /** * Create a new dialog. * * @param parentShell the parent shell * @param dialogTitle the title * @param dialogTitleImage the title image * @param dialogMessage the message * @param detail the error to display * @param dialogImageType the type of image * @param dialogButtonLabels the button labels * @param defaultIndex the default selected button index */ public InternalErrorDialog(Shell parentShell, String dialogTitle, Image dialogTitleImage, String dialogMessage, Throwable detail, int dialogImageType, String[] dialogButtonLabels, int defaultIndex) { super(parentShell, dialogTitle, dialogTitleImage, dialogMessage, dialogImageType, dialogButtonLabels, defaultIndex); defaultButtonIndex = defaultIndex; this.detail = detail; setShellStyle(getShellStyle() | SWT.APPLICATION_MODAL); } //Workaround. SWT does not seem to set rigth the default button if //there is not control with focus. Bug: 14668 public int open() { create(); Button b = getButton(defaultButtonIndex); b.setFocus(); b.getShell().setDefaultButton(b); return super.open(); } /** * Set the detail button; * @param index the detail button index */ public void setDetailButton(int index) { detailButtonID = index; } /* (non-Javadoc) * Method declared on Dialog. */ protected void buttonPressed(int buttonId) { if (buttonId == detailButtonID) { toggleDetailsArea(); } else { super.buttonPressed(buttonId); } } /** * Toggles the unfolding of the details area. This is triggered by * the user pressing the details button. */ private void toggleDetailsArea() { Point windowSize = getShell().getSize(); Point oldSize = getContents().computeSize(SWT.DEFAULT, SWT.DEFAULT); if (text != null) { text.dispose(); text = null; getButton(detailButtonID).setText(IDialogConstants.SHOW_DETAILS_LABEL); } else { createDropDownText((Composite) getContents()); getButton(detailButtonID).setText(IDialogConstants.HIDE_DETAILS_LABEL); } Point newSize = getContents().computeSize(SWT.DEFAULT, SWT.DEFAULT); getShell().setSize(new Point(windowSize.x, windowSize.y + (newSize.y - oldSize.y))); } /** * Create this dialog's drop-down list component. * * @param parent the parent composite */ protected void createDropDownText(Composite parent) { // create the list text = new Text(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); text.setFont(parent.getFont()); // print the stacktrace in the text field try { ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintStream ps = new PrintStream(baos); detail.printStackTrace(ps); ps.flush(); baos.flush(); text.setText(baos.toString()); } catch (IOException e) { } GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL | GridData.GRAB_VERTICAL); data.heightHint = text.getLineHeight() * TEXT_LINE_COUNT; data.horizontalSpan = 2; text.setLayoutData(data); } /** * Convenience method to open a simple Yes/No question dialog. * * @param parent the parent shell of the dialog, or <code>null</code> if none * @param title the dialog's title, or <code>null</code> if none * @param message the message * @param detail the error * @param defaultIndex the default index of the button to select * @return <code>true</code> if the user presses the OK button, * <code>false</code> otherwise */ public static boolean openQuestion(Shell parent, String title, String message, Throwable detail, int defaultIndex) { String[] labels; if (detail == null) { labels = new String[] { IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL }; } else { labels = new String[] { IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL, IDialogConstants.SHOW_DETAILS_LABEL }; } InternalErrorDialog dialog = new InternalErrorDialog(parent, title, null, // accept the default window icon message, detail, QUESTION, labels, defaultIndex); if (detail != null) { dialog.setDetailButton(2); } return dialog.open() == 0; } }